This is because appearance for each material can be customized into anything you want. Even the default materials from Solidworks.Edit: Scratch that....It looks like the Default materials can't be modified....can only be copied, then modified.

However, you can still, after applying the material, change the appearance of the part to anything you want, regardless of the material applied.

You are probably asking, which material gives this material appearance by default.

Again, I don't think that anyone can determine this because it could be any number of things.

But in any case, that is a SolidWorks image, not a photograph of an actual part?

In SolidWorks I can make a part Gold material, but I doubt you would pay me for the reported weight in gold.

The part should be some grade of steel given the function of the part.

Curious: Have you modeled anything without following someone else's instructions on a Youtube video?

I recommend that you look around you for a Stapler or some other common office item and attempt to model it and determine the various materials (without using the internet, (other than asking questions here) and without using a book (but I know how you feel about books)).

You can follow tutorials all day, but until you have put into practice what you have learned...

Oops, I didn't follow the video long enough to see where they added Appearance (material?).